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Sorry to resurrect this so much later, but I was just looking for the same thing myself.

Twitch does still have the concert actually! You can see the whole 5 hours plus right here (http://www.twitch.tv/twitch/b/433486043), and of course if you want to keep it you can always use Video Download Helper or a similar stream ripper. Just bear in mind it's made up of multiple video segments so you'll only get 30 minutes at a time from VDH.